In CUPS architecture, support is added for S2b interface where untrusted Wi-Fi calls from ePDG connects to SAEGW (Pure-P).

Currently, support for following procedures are available:

• Support procedures for session establishment:

  • GTP based S2b for roaming, non-roaming and LBO (3GPP TS 23.402 [4] clause 7.2.4).

  • Emergency services over GTP based S2b (3GPP TS 23.402 [4] clause 7.2.5).

  • UE-initiated connectivity to additional PDN from Un-trusted Non-3GPP IP Access with GTP (3GPP TS 23.402 [4] clause 7.6.3).

• Support procedures for session release:

  • UE/ePDG-initiated detach procedure with GTP on S2b (TS 23.402 [4] clause 7.4.3.1).

  • HSS/AAA-initiated detach procedure with GTP on S2b (TS 23.402 [4] clause 7.4.4.1).

• Support procedure for bearer deactivation:

  • P-GW Initiated Bearer Deactivation with GTP on S2b (TS 23.402 [4] clause 7.9.2).